I collect old calcs, and found this one recently at an estate sale... Melcor 590 I cannot find any info on the company... Can anyone give me any info...? Is it...
Bill: Thanks for the vote of confidence on our book. Mike et all: If you would like a copy of the book, you can buy it from amazon or you can order from me...
Guy Ball
mrcalc@...
Nov 15, 2001 6:39 am
251
... The best way to find such things seems to be to watch eBay. But on the off chance that someone here might have extra Casio gear, I'm looking for the Casio...
Here's a cute test for a scientific calculator. (Let ^ represent exponentiation.) Compute 2.25 ^ 3.375 and subtract 3.375 ^ 2.25 from it. The exact answer is...
Bob Patton
patton@...
Nov 16, 2001 3:34 am
253
... That really is cute. Here's an informal proof: First, 2.25 is 9/4 and 3.375 is 27/8. So log (2.25 ^ 3.375) = 27/8 log (9/4) = 27/8 (log(9) - log(4)) = 27/8...
Oh joy! While we were passing through a very small town in an isolated rural area my wife spotted a new thrift store. I popped in and there among the...
Bob Patton
patton@...
Nov 19, 2001 1:58 am
256
A demo for 8-digit 4-function calculators that impresses casual users is to quickly produce 1.2345678 (or 1.2345679 with rounding) via a built-in constant...
Bob Patton
patton@...
Nov 19, 2001 2:03 am
257
Since some interest was expressed: The function x^y = y^x is continuous for x > 1. Most solutions are transcendental but it has a set of rational solutions of...
Bob Patton
patton@...
Nov 20, 2001 4:04 am
258
... Does this mean that y = ((t+1)/t)^t, x = ((t+1)/t)^(t+1) for t = 1,2,3,... also holds? Bob...
Received this message for posting to the oldcalcs group. Hope someone can shed some light on Joe. I can't get in touch with him anymore either. Message...
To Everybody: I'm not a spokesman for Joe, but I do know that he is doing OK but most likely not checking his email. If you need to get in touch with Joe, I...
... In reply to the above, yes. The curve is symmetrical about the line x = y and crosses this line at e,e. Thus x=2,y=4 and x=4,y=2 are both solutions....
Bob Patton
patton@...
Nov 21, 2001 1:53 am
262
Hello, My name is Janick and I am from Belgium (Europe). I am in possession of a working commodore N60 which I would like to use for flight navigation....
Hello, My name is Janick and I am from Belgium (Europe). I am in possession of a working commodore N60 which I would like to use for flight navigation....
Calculator Quirks #006 The Commodore 774D is a shirt-pocket LED machine that was very inexpensive ($9.95 in 1975). A major cost cutting feature that was not...
Bob Patton
patton@...
Nov 27, 2001 2:11 am
269
UNSUBSCRIBE...
pikeenterprise@...
Nov 27, 2001 7:33 am
270
Hi There, Cost reductin was a big thing around 1975. If you own a TI-1200 or TI-1250 you should calculate: 12345678-23456789= ? The first series got the...
If a calculator has a memory then it can be quite handy to exchange the memory and display values. If your machine has a memory-exchange key, well and good....
Bob Patton
patton@...
Dec 5, 2001 1:45 am
272
I received a telephone call from Dr. Peggy Kidwell, curator of office machines at the Smithsonian. She is looking for information on early electronic cash...
Ernie Jorgenson
ejorgens@...
Dec 7, 2001 8:15 pm
273
Hello All, The Calculator Reference has moved... My old service provider (USIT.NET) was purchased by ONEMAIN.COM who was then purchased by EarthLink. Then...
Rick Furr
rfurr@...
Dec 10, 2001 2:33 pm
274
Calculator Quirks #007 The Casio AL-8 is a mid 1970's fluorescent calculator that squeezes 6 special functions and a 4-key memory into 24-keys. They did it...
Bob Patton
patton@...
Dec 11, 2001 2:17 am
275
Hi! Merry Christmas and Happy New Year! Please visit Soviet calculators and electronic games emulator at http://www.emulator3000.com With best gegards, Sergei...
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